CN101390237B - Fuel cell system and operation method for fuel cell system - Google Patents

Fuel cell system and operation method for fuel cell system Download PDF

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Publication number
CN101390237B
CN101390237B CN2007800061291A CN200780006129A CN101390237B CN 101390237 B CN101390237 B CN 101390237B CN 2007800061291 A CN2007800061291 A CN 2007800061291A CN 200780006129 A CN200780006129 A CN 200780006129A CN 101390237 B CN101390237 B CN 101390237B
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fuel cell
fuel
circulating pump
gas
temperature
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CN2007800061291A
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Chinese (zh)
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CN101390237A (en
Inventor
滨田研一
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to JP2006078817A priority Critical patent/JP5226936B2/en
Priority to JP078817/2006 priority
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to PCT/IB2007/000659 priority patent/WO2007107836A1/en
Publication of CN101390237A publication Critical patent/CN101390237A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04097Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04225Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during start-up
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04231Purging of the reactants
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04253Means for solving freezing problems
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00Fuel cells; Manufacture thereof
    • H01M8/04Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04268Heating of fuel cells during the start-up of the fuel cells
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

Abstract

A fuel cell system (100) includes: a circulation pump (50) provided on a fuel gas circulation channel (27) so as to circulate a fuel gas; a pump temperature detection portion (420) that detects a temperature of the circulation pump (50); a warmup portion that warms up the circulation pump; a pump control portion (410) that drives the circulation pump; and a breakdown determination portion (450) that determines whether the circulation pump has broken. At the start of the fuel cell system, if the pump temperature detected by the pump temperature detection portion (420) is below the melting point of water, the warmup portion warms the circulation pump, and the pump control portion (410) drives the circulation pump (50). If the pump temperature is higher than or equal to the melting point of water and the rotation speed of the circulation pump (50) is less than a predetermined speed, the breakdown determination portion (450) determines that the circulation pump (50) has broken.

Description

The method of operation of fuel cell system and fuel cell system
Technical field
The present invention relates to fuel cell system, and the method for operation of fuel cell system.Especially, the present invention relates to the fault detect relevant with the circulating pump of circulating fuel gas.
Background technology
In recent years, comprise the fuel gas of hydrogen by use and fuel cell that the oxygen containing oxidizing gas of bag produces electric power attracts much attention.Fuel cell system with this fuel cell comprises: the fuel gas supply passage, and it arrives fuel cell with fuel gas supply; Fuel-gas circulation passage, it circulates from the fuel gas of fuel cell exhaust by fuel gas being turned back to the fuel gas supply passage, is used to reuse; Circulating pump, it is arranged on the fuel-gas circulation passage so that fuel gas circulates, or the like.In these gas passages, wherein the passage of fuel gas circulates is also referred to as circulatory system passage.
Aforesaid fuel cell system is carried out pump and is driven detection when starting, wherein attempt driving circulating pump and detect circulating pump whether be driven (Japanese patent application JP-A-2004-172025 number).Drive in the detection at this pump,, judge that then circulating pump has fault, take measures then if detect the driving failure of circulating pump, for example, generation outage.
In fuel cell, water is produced by the electrochemical reaction in the power generation process, and the water that reaction produces circulates in circulatory system passage, is retained in the circulating pump sometimes.If there is water to retain, external air temperature drops to solidifying point operation following and fuel cell system and stops certain hour, remains in the water freezing in the circulating pump.In this case, exist circulating pump to drive the danger of failure.
Therefore,, carry out pump and drive and detect and the driving failure of circulating pump, can expect because the situation of the driving failure that causes circulating pump of freezing and because fault causes the situation of the driving failure of circulating pump if when fuel cell start-up.Therefore, driving detects for pump, has the risk that does not in fact have fault owing to judge circulating pump to have fault under the situation of the icing circulating pump driving failure that causes mistakenly.As a result, be stopped this inconvenient risk although exist circulating pump in fact not have fault but still cause to generate electricity.
Summary of the invention
The purpose of this invention is to provide a kind of technology of judging exactly that when fuel cell start-up circulating pump is whether normal or break down.
Fuel cell system according to a scheme of the present invention comprises: fuel cell; Fuel gas supply portion; The fuel gas supply passage, it will be from the fuel gas supply of fuel gas supply part to fuel cell; Fuel-gas circulation passage, it is connected to fuel cell and fuel gas supply passage, and circulates from the fuel gas of fuel cell exhaust by fuel gas being turned back to the fuel gas supply passage, is used to reuse; Circulating pump, it is arranged on the fuel-gas circulation passage so that fuel gas circulates; Temperature detecting part, it detects the temperature of fuel cell system; The pump control part, it drives circulating pump; And breakdown determination portion, it judges whether circulating pump has fault.In fuel cell system, the pump control part drives circulating pump, if and the rotating speed that is greater than or equal to the fusing point of water and circulating pump by the temperature of the detected fuel cell system of temperature detecting part is less than desired speed, then breakdown determination portion judges that circulating pump has fault.
The fuel cell system of this programme can further comprise warmup portion, and it carries out preheating to circulating pump.When fuel cell start-up, if be lower than the fusing point of water by the temperature of the detected fuel cell system of temperature detecting part, then warmup portion can the heat cycles pump.
According to the fuel cell system of above-mentioned structure,, also can determine the whether normal or reality of circulating pump exactly fault has taken place even when circulating pump freezes.
The fuel cell system of this programme may further include the oxidizing gas supply unit that supplies oxidation gas to fuel cell.If be lower than the fusing point of water by the temperature of the detected fuel cell system of temperature detecting part, then warmup portion can make fuel gas supply portion and oxidizing gas supply unit respectively fuel gas and oxidizing gas be supplied to fuel cell so that the fuel cell execution is generated electricity, thereby circulating pump is heated by the heat that generating produced.
Therefore, can use the device that is arranged in the fuel cell system that circulating pump is heated, and the quantity of the part of fuel cell system can reduce to minimum.
In the fuel cell system of this programme, circulating pump can be near fuel cell arrangement.Circulating pump can be an integral body with fuel cell arrangement in addition.
Therefore, the heat that produces in the fuel cell can promptly be delivered to circulating pump, and circulating pump preheating promptly.
The fuel cell system of this programme may further include: purification channel, and it is put into the outside of fuel cell system with the loop direction of fuel gas along fuel gas from the upstream row of the set position of the circulating pump of fuel-gas circulation passage; Break valve, it is arranged on the purification channel; The valve control part, it carries out the open-close control of described break valve; And the oxidizing gas adjusting portion, it regulates the quantity delivered that is supplied to the oxidizing gas of fuel cell by the oxidizing gas supply unit.When making fuel cell carry out generating, warmup portion can be opened the quantity delivered of break valve with the fuel gas of the fuel cell of increasing supply by making the valve control part, and make the quantity delivered of the corresponding oxidizing gas of quantity delivered of increase of oxidizing gas adjusting portion and fuel gas, increase the energy output of fuel cell.
Therefore, because along with the increase of the energy output of fuel cell is also increased by the heat that generating is produced, circulating pump is preheating promptly.
Method of operation according to the fuel cell system of the solution of the present invention is a kind of method of operation of fuel cell system, and described fuel cell system comprises: fuel cell; Fuel gas supply portion; Will be from the fuel gas supply of fuel gas supply part fuel gas supply passage to fuel cell; Fuel-gas circulation passage, it is connected to fuel cell and fuel gas supply passage, and will be used to reuse from the fuel gas circulates of fuel cell exhaust to the fuel gas supply passage; And be arranged on the fuel-gas circulation passage with the circulating pump of circulating fuel gas, described method of operation comprises: the step that (A) detects the temperature of fuel cell system when fuel cell start-up; (B), then circulating pump is heated and drives the step of circulating pump if the temperature of detected fuel cell system is lower than the fusing point of water; (C) if the temperature of fuel cell system is greater than or equal to the rotating speed of the fusing point of water and circulating pump less than desired speed, then be judged to be the step that circulating pump damages.
According to the method for operation of above-mentioned fuel cell system,, also can determine the whether normal or reality of circulating pump exactly fault has taken place even when circulating pump freezes.
The present invention is not limited to the such scheme of device, such as above-mentioned fuel cell system, method of operation of fuel cell system or the like, can also in multiple other scheme, realize, for example, construct the scheme of the computer program of this method or device, perhaps as the scheme that has wherein write down the recording medium of this computer program, as comprising described computer program and be embodied in the scheme of the digital signal in the carrier wave, or the like.
If the present invention is constructed to computer program, comprised and record recording medium of described program or the like, wherein, the present invention can be by comprising the operation of controlling above-mentioned device the form of whole procedure be provided with, perhaps also can be provided with by the form that only comprises the part of carrying out function of the present invention.
Description of drawings
From the description of following preferred embodiment in conjunction with the accompanying drawings, above-mentioned and the further purpose of the present invention, feature and advantage will become obvious, wherein identical Reference numeral is used to represent components identical, and wherein: Fig. 1 is the block diagram of structure that shows the fuel cell system 100 of embodiments of the invention; And Fig. 2 be the flow chart of failure of pump trace routine of fuel cell system 100 execution of the embodiment shown in Fig. 1.
Embodiment
Hereinafter will describe embodiments of the invention by following program.A. embodiment: the structure of A1. fuel cell system: A2. pump breakdown detection process: B. improves:
A. embodiment: the structure of A1. fuel cell system: Fig. 1 is the block diagram that shows as the structure of the fuel cell system 100 of embodiments of the invention.Described fuel cell system 100 comprises fuel cell 10, hydrogen gas tank 20, air blast 30, circulating pump 50, diluter 60, temperature sensor 70, hydrogen shut-off valve 200, pressure-regulating valve 220, vent valve 240 and control circuit 400.
Fuel cell 10 is solid polymer formula fuel cells, and has the stacked structure of a plurality of element cells (being called " battery " hereinafter simply) that wherein piled up as component units.Each battery has the dielectric film (not shown) and is clipped in structure between anode (not shown) and the negative electrode (not shown).Fuel cell 10 by will hydrogeneous fuel gas supply to the anode-side of each battery, and electrochemical reaction is carried out with the generation electromotive force cathode side that oxygen containing oxidizing gas supplies to each battery.Fuel cell 10 supplies to the predetermined load (for example motor, storage battery) that links to each other with fuel cell 10 with the electric energy that produces.For fuel cell 10, can use the polytype fuel cell except that above-mentioned solid polymer fuel cell, for example hydrogen is isolated membrane type fuel cell (hydrogen separation membrane typefuel cell), alkaline aqueous solution electrolytic fuel cell (alkaline aqueous solutionelectrolyte type fuel cell), phosphoric acid electrolytic fuel cell (phosphoric acidelectrolyte type fuel cell), fused carbonate electrolytic fuel cell (molten carbonateelectrolyte type fuel cell) or the like.In the explanation hereinafter, the passage that the fuel gas in fuel cell 10 is flowed through is called " anode passages 25 ", and the passage that oxidizing gas is flowed through is called " cathode channel 35 ".
Hydrogen gas tank 20 is storage devices of wherein having stored high pressure hydrogen.Hydrogen gas tank 20 is connected to the anode passages 25 of fuel cell 10 via fuel gas supply passage 24.Hydrogen shut-off valve 200 and pressure-regulating valve 220 are set in sequence on the fuel gas supply passage 24 from hydrogen gas tank 20 sides.By opening hydrogen shut-off valve 200, the hydrogen gas that acts as a fuel is fed into fuel cell 10.Except that hydrogen gas tank 20, also can adopt by reforming reaction to produce hydrogen and feed hydrogen gas to the device of anode-side such as the raw material of alcohol, hydrocarbon (hydrocarbon), aldehyde (aldehyde) etc.
The outlet side of anode passages 25 links to each other by gas circulation channel 27 with fuel gas supply passage 24.Circulating pump 50 is arranged on the gas circulation channel 27.By driving circulating pump 50, the fuel gas of using during electrochemical in the anode of fuel cell 10 is anti-is supplied to the anode passages 25 (anode) of fuel cell 10 once more via gas circulation channel 27 and fuel gas supply passage 24, thereby is used again to be used for generating.Hereinafter, the passage of fuel gas circulates, that is, the passage that is formed by gas circulation channel 27, fuel gas supply passage 24 and anode passages 25 is also referred to as " hydrogen gas circulating system passage ".
Circulating pump 50 can be arranged to fuel cell 10 and contact, thereby forms an integral body via support column 55 and fuel cell 10.
Fuel cell system 100 is provided with the temperature sensor 70 of the temperature of the pump chamber (not shown) that detects circulating pump 50.
The point of purification channel 28 between fuel cell 10 and circulating pump 50 that is connected to diluter 60 told from gas circulation channel 27.Vent valve 240 is arranged on the purification channel 28.When fuel gas circulation time in the hydrogen gas circulating system passage just, the foreign gas (nitrogen etc.) except that hydrogen is mixed in the fuel gas, thereby density of hydrogen is descended gradually.As a result, the decreased performance of fuel cell 10.Therefore, fuel cell system 100 is periodically opened vent valve 240.Then, fuel gas discharge is in purification channel 28.Hereinafter will the details relevant with the fuel gas that is discharged into purification channel 28 be described.
Air blast 30 is the devices that the air as oxidizing gas supplied to the negative electrode (not shown) of fuel cell 10.Air blast 30 is connected to the cathode channel 35 of fuel cell 10 via oxidizing gas feed path 34.
The cathode channel 35 of fuel cell 10 also is connected (at its outlet side) to oxidizing gas discharge-channel 36.Oxidizing gas after using in the electrochemical reaction at negative electrode place is discharged in the oxidizing gas discharge-channel 36.
Diluter 60 is to dilute the device that is included in the hydrogen in the fuel gas by mixing with oxidizing gas.Diluter 60 is connected to oxidizing gas discharge-channel 36, purification channel 28 and mixture gas discharge channel 45.The stream plate (flowplate) 61 that diluter 60 is made by porous ceramic is divided into two chambers, be diluter 60 have from the fuel gas of purification channel 28 flow into and park park chamber 62, and the dilution chamber 63 that flows into from the oxidizing gas of oxidizing gas discharge-channel 36.
When vent valve 240 was opened, the fuel gas that flows in gas circulation channel 27 flowed into parking chamber 62 and parking wherein of diluters 60 by purification channel 28.On the other hand, the oxidizing gas that flows into the dilution chamber 63 of diluter 60 directly passes through dilution chamber 63, and is discharged into the outside via mixture gas discharge channel 45.At this moment, because passing through of oxidizing gas is anchored in the fuel gas of parking in the chamber 62 and is sucked into gradually in the dilution chamber 63 via porous flow plate 61.As a result, the mist of fuel gas and oxidizing gas flows out the dilution chamber 63 of diluter 60, and is discharged into the outside of fuel cell system 100 via mixture gas discharge channel 45.In this way, the hydrogen oxidized gas in the fuel gas that circulates in the hydrogen gas circulating system passage dilutes, and is discharged into the outside of fuel cell system 100.
Control circuit 400 is constructed to comprise the logical circuit as the microcomputer of critical piece.Particularly, control circuit 400 comprises: the CPU (not shown) of carrying out predetermined computation etc. along with the default control program; Stored the ROM (not shown) that CPU carries out the required control program of multiple calculation procedure order, control data etc. in advance; Wherein write temporarily and read the RAM (not shown) that CPU carries out the required several data of multiple calculation procedure; The input/output end port (not shown) of the multiple signal of input and output, or the like.Control circuit 400 is carried out relevant with fuel cell system 100, particularly, and with air blast 30, circulating pump 50, hydrogen shut-off valve 200, vent valve 240 or the like relevant various control.
Control circuit 400 plays the function of pump control part 410, temperature detecting part 420, valve control part 430, air blast control part 440 and breakdown determination portion 450, and carries out failure of pump trace routine described below.Temperature detecting part 420 detects the temperature of circulating pump 50 (its pump chamber) from temperature sensor 70.
When system start-up, the fuel cell system 100 of described embodiment is carried out the pump breakdown detection process of the fault that detects circulating pump 50.Hereinafter will be described described process.
A2. pump breakdown detection process Fig. 2 is the flow chart of the pump breakdown detection process carried out by the fuel cell system 100 of described embodiment.Prerequisite when pump breakdown detection process starts is that hydrogen shut-off valve 200 and vent valve 240 are all closed, and air blast 30 and circulating pump 50 be not driven, that is, fuel cell 10 is not in generating state.
At first, the pump control part 410 drive signal V that will drive circulating pump 50 sends to circulating pump 50 (step S10).If circulating pump 50 is normal,, be driven based on this signal cycle pump 50 in case receive drive signal V.
Next, pump control part 410 judges whether circulating pump 50 is driven, and particularly, whether circulating pump 50 is with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (step S20).Specific design based on fuel cell system 100 is determined predetermined rotation speed alpha, may be, for example, " 1 ".
If pump control part 410 is judged circulating pumps 50 with predetermined rotation speed alpha or surpass predetermined rotation speed alpha rotation (among the step S20 for being), then breakdown determination portion 450 judgement circulating pumps 50 finish this program then just by driven (step S200).By way of parenthesis, after this, control circuit 400 for example can and be opened hydrogen shut-off valve 200 by blower 30 and begin generating.
On the other hand, if pump control part 410 is judged circulating pump 50 and is not just rotated (being not among the step S20) with predetermined rotation speed alpha or above predetermined rotation speed alpha that temperature detecting part 420 detects the temperature (its pump chamber) (being called " circulating pump temperature Tp 1 " hereinafter) (step S30) of circulating pump 50 from temperature sensor 70.In this case, pump control part 410 stops to send drive signal V.
Then, temperature detecting part 420 judges whether circulating pump temperature Tp 1 is lower than the fusing point (about 0 ℃) (step S40) of water.The variation that the indication of the fusing point of water " about 0 ℃ " is based on fusing point is depended on what the fact of pressure state was considered.
If temperature detecting part 420 is judged circulating pump temperature Tp 1 and is not less than the fusing point (about 0 ℃) of water (step S40 is for denying), although circulating pump 50 does not still drive failure because circulating pump 50 (its pump chamber) freezes, then breakdown determination portion 450 judges that circulating pump 50 has fault (step S100).Then, EP (end of program).Afterwards, control circuit 400 for example can be carried out the program of forbidding fuel cell 10 generatings.
On the other hand, be lower than the fusing point (about 0 ℃) (step S40 is for being) of water if temperature detecting part 420 is judged circulating pump temperature Tp 1, control circuit 400 judges that circulating pumps 50 are icing and can not be driven, and by fuel cell 10 generate electricity (step S50).Particularly, valve control part 430 is opened hydrogen shut-off valve 200, and carries out the open and close controlling of vent valve 240, is less than or equal to predetermined value beta thereby the quantity delivered of the fuel gas that supplies to anode passages 25 can not become.In addition, air blast control part 440 blower 30 will be so that will supply to the negative electrode of fuel cell 10 with the oxidizing gas of the corresponding quantity of quantity delivered of fuel gas.In this mode, generate electricity by fuel cell 10.Therefore, along with the carrying out of generating, the temperature of fuel cell 10 raises, and is arranged as with the circulating pump 50 (its pump chamber) of fuel cell 10 contacts and is preheating to relative high temperature.In this case, the fuel gas that discharges from purification channel 28 is diluted by diluter 60, and is discharged into the outside of fuel cell system 100.If with predetermined value beta be set at make fuel cell 10 fully the numerical value of warm-up cycle pump 50 be suitable.Predetermined value beta is based on the specific design of fuel cell system 100 and determine.In addition, the frequency of opening vent valve 240 is also determined based on predetermined value beta.
Therefore, when generating electricity by fuel cell 10, by opening the increase supply quantity of fuel gas of anode of fuel cell 10 of hydrogen shut-off valve 200, and be fed into the negative electrode of fuel cell 10 with the corresponding oxidizing gas of the quantity delivered of fuel gas.In this mode, can increase the energy output of fuel cell 10, and circulating pump 50 preheating promptly.
When the generating of fuel cell 10 starts, temperature detecting part 420 detects the temperature (hereinafter being called " circulating pump temperature Tp 2 ") (step S60) of circulating pump 50 (its pump chamber) from temperature sensor 70, and judges whether circulating pump temperature Tp 2 is greater than or equal to the fusing point (about 0 ℃) (step S70) of water.If temperature detecting part 420 is judged detected circulating pump temperature Tp 2 and is not greater than or equal to the fusing point (about 0 ℃) of water (being not among the step S70) that described program turns back to step S60.
If temperature detecting part 420 is judged circulating pump temperature Tp 2 and is greater than or equal to the fusing point (about 0 ℃) of water (among the step S70 for being) that the drive signal V that pump control part 410 will drive circulating pump 50 once more sends to circulating pump 50 (step S80).
Then, pump control part 410 judges whether circulating pump 50 is driven, and particularly, whether circulating pump 50 is just with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (step S90).
If pump control part 410 judges that circulating pumps 50 are just with predetermined rotation speed alpha or surpass predetermined rotation speed alpha rotation (among the step S90 for being), although breakdown determination portion 450 judge pump control parts 410 send drive signal V (step S10) to attempt to drive circulating pump 50 circulating pump 50 not have driven reason (among the step S20 for not) be that circulating pump 50 freezes, and determine circulating pump 50 and can normally be driven (step S200).Afterwards, EP (end of program).Then, for example control circuit 400 can start generating by fuel cell 10.
On the other hand, if pump control part 410 judges that circulating pump 50 is not just with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (being not among the step S90), although because because warm-up cycle pump 50 (its pump chamber) does not have to freeze and the driving failure of circulating pump 50, then breakdown determination portion 450 judges that circulating pump 50 has fault (step S100).Then, EP (end of program).By way of parenthesis, at the end of program, can generation outage under the situation that the generating of fuel cell 10 is carried out in the process of step S50.In this case, pump control part 410 stops to send drive signal V.
As mentioned above, in fuel cell system 100, if circulating pump 50 drives failure, and the temperature of circulating pump 50 (its pump chamber), promptly the circulating pump temperature Tp 1, is lower than the fusing point (about 0 ℃) of water, the generating of starting fluid battery 10 is to carry out preheating to circulating pump 50, thereby the fusing point (about 0 ℃) that the temperature that makes circulating pump 50 (its pump chamber) becomes and is greater than or equal to water after this, is attempted circulating pump 50 is driven once more.Under the situation that circulating pump 50 freezes, also can judge whether circulating pump 50 is normal even this makes exactly, or fault has taken place in reality.
In addition, in fuel cell system 100, circulating pump 50 is arranged to fuel cell 10 and contacts.In the failure of pump trace routine, the heat that makes so produce carries out preheating to circulating pump 50 thereby fuel cell 10 generates electricity.This makes it possible to by the device that use is arranged in the fuel cell system 100 circulating pump 50 be carried out preheating.Therefore, the quantity of the part of fuel cell system 100 can reduce to minimum.In addition, because circulating pump 50 contacts with fuel cell 10, the heat that produces in the fuel cell 10 promptly is delivered to circulating pump 50, therefore can make circulating pump preheating promptly.
In the present invention, hydrogen gas tank 20 is corresponding to fuel gas supply portion, and gas circulation channel 27 is corresponding to fuel-gas circulation passage.In addition, vent valve 240 is corresponding to break valve.Pump control part 410 is corresponding to the pump control part.Temperature detecting part 420 is corresponding to temperature detecting part.Valve control part 430 is corresponding to the valve control part.Air blast control part 440 is corresponding to the oxidizing gas adjusting portion.Breakdown determination portion 450 is corresponding to breakdown determination portion.Air blast 30 is corresponding to the oxidizing gas supply unit.In addition, air blast 30, hydrogen gas tank 20, hydrogen shut-off valve 200, control circuit 400 and fuel cell 10 are corresponding to warmup portion.
B. improve: the invention is not restricted to the foregoing description, but can under the situation that does not deviate from spirit of the present invention, implement in many ways.
B1. improve 1: although in the fuel cell system 100 of the foregoing description, circulating pump 50 is arranged to fuel cell 10 and contacts, and this is not construed as limiting the invention.Circulating pump 50 need not be arranged to fuel cell 10 and contact, but circulating pump 50 can be arranged to fuel cell 10 at a distance of preset distance, if this distance can make circulating pump 50 by the generating preheating of fuel cell 10.This improvement can realize and the essentially identical effect of the foregoing description.
B2. improve 2: although in the fuel cell system 100 of the foregoing description, circulating pump 50 is arranged to fuel cell 10 and contacts, and the heat that produces by the generating of using fuel cell 10 carries out preheating to circulating pump 50, but this is not construed as limiting the invention.For example, circulating pump 50 can be provided with thermal source, and such as heater etc., so circulating pump 50 will be preheated.In this improves, circulating pump 50 need not be arranged as with fuel cell 10 and contact, therefore arrange the degree of freedom increase of circulating pump 50.
B3. improve 3: although in the failure of pump trace routine of carrying out by the fuel cell system 100 of the foregoing description (Fig. 2), temperature detecting part 420 directly detects circulating pump temperature Tp 1 from circulating pump 50 in the process of step S30, but this is not construed as limiting the invention.For example, temperature detecting part 420 can detect in fuel cell system 100 atmosphere outside temperature, and can estimate the temperature of circulating pump 50 from atmospheric temperature.In addition, temperature detecting part 420 can go out the temperature of circulating pump 50 from the temperature estimation of the predetermined portions (for example, fuel cell 10) in the fuel cell system 100.
In addition, for example temperature detecting part 420 directly detects circulating pump temperature Tp 2 from circulating pump 50 in the process of step S60.Yet this is not construed as limiting the invention.For example, temperature detecting part 420 can detect the duration of fuel cell 10 generatings, and can be by considering that the power generation continuous time is together with the quantity delivered of fuel gas, the temperature that fuel cell system 100 atmosphere outside temperature are estimated circulating pump 50.This improvement need not be provided with temperature sensor 70, thereby can reduce the number of part.
B4. improve 4: in the failure of pump trace routine (Fig. 2), because the generating of fuel cell 10 makes circulating pump temperature Tp 2 become after the fusing point that is greater than or equal to water (among the step S70 for being), the fuel cell system 100 of the foregoing description sends to circulating pump 50 (step S80) with drive signal V.In this case, if circulating pump 50 judges then that not just with predetermined rotation speed alpha or above the predetermined rotation speed alpha rotation circulating pump 50 has fault.Yet this is not construed as limiting the invention.For example, in the failure of pump trace routine of Fig. 2, can omit the process of step S60, and can carry out following program instead to step S90.
That is, control circuit 400 begins generating by fuel cell 10 after (step S50), pump control part 410 sends to circulating pump 50 (step S60A) with drive signal V.Next, pump control part 410 judges whether circulating pump 50 is driven, and particularly, whether circulating pump 50 is just with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (step S70A).If pump control part 410 is judged circulating pump 50 just with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (step S70A is for being), but breakdown determination portion 450 is judged circulating pump 50 driven (step S200).
On the other hand, if pump control part 410 judges that circulating pump 50 is not just with predetermined rotation speed alpha or above predetermined rotation speed alpha rotation (being not among the step S70A), temperature detecting part 420 detects circulating pump temperature Tp 2 (step S80A) subsequently, and judges whether circulating pump temperature Tp 2 is greater than or equal to the fusing point of water (about 0 ℃) (step S90A).If temperature detecting part 420 is judged detected circulating pump temperature Tp 2 and is not greater than or equal to the fusing point (about 0 ℃) of water (being not among the step S90A) that program turns back to step S60A.
If temperature detecting part 420 is judged circulating pump temperature Tp 2 and is greater than or equal to the fusing point (about 0 ℃) of water (among the step S90A for being), although circulating pump 50 drives failure because circulating pump 50 (its pump chamber) is because preheating is not frozen, then breakdown determination portion 450 judges that circulating pump 50 has fault (step S100).Then, EP (end of program).Above-mentioned improvement has also realized and the essentially identical effect of the foregoing description.
B5. improve 5: although in the above-described embodiments, a plurality of parts of control circuit 400 provide as software, and they also can be used as hardware and provide.In addition, the part that provides as hardware in the above-described embodiments can be used as software provides.

Claims (11)

1. fuel cell system comprises:
Fuel cell (10);
Fuel gas supply portion (20);
Fuel gas supply passage (24), it will be from the fuel gas supply of described fuel gas supply portion to described fuel cell;
Fuel-gas circulation passage (27), it is connected to described fuel cell and described fuel gas supply passage, and circulate from the described fuel gas of described fuel cell exhaust by described fuel gas being turned back to described fuel gas supply passage, be used to reuse;
Circulating pump (50), it is arranged on the described fuel-gas circulation passage so that described fuel gas circulates;
Temperature detecting part (420), it detects the temperature of the described circulating pump (50) of described fuel cell system, perhaps from the temperature of the described circulating pump (50) of the described fuel cell system of temperature estimation of atmospheric temperature or the described fuel cell in the described fuel cell system;
Pump control part (410), it drives described circulating pump; And
Breakdown determination portion (450), it judges whether described circulating pump has fault,
If the described temperature of the described circulating pump of the described fuel cell system that is wherein detected by described temperature detecting part or estimate is greater than or equal to the fusing point of water and the rotating speed of the described circulating pump that drives by described pump control part less than desired speed, then described breakdown determination portion judges that described circulating pump has fault.
2. fuel cell system as claimed in claim 1 further comprises:
Warmup portion, it carries out preheating to described circulating pump,
Wherein when fuel cell start-up, if detected or the described temperature of the described circulating pump of the described fuel cell system estimated is lower than the fusing point of described water by described temperature detecting part, then described warmup portion heats described circulating pump.
3. fuel cell system as claimed in claim 2 further comprises the oxidizing gas supply unit (30) that supplies oxidation gas to described fuel cell,
If the described temperature of the described circulating pump of the described fuel cell system that is wherein detected by described temperature detecting part or estimate is lower than the fusing point of described water, then described warmup portion makes described fuel gas supply portion and described oxidizing gas supply unit respectively described fuel gas and described oxidizing gas be supplied to described fuel cell so that the execution of described fuel cell is generated electricity, thereby described circulating pump is heated by the heat that described generating produced.
4. fuel cell system as claimed in claim 3, wherein said circulating pump is near described fuel cell arrangement.
5. as claim 3 or 4 described fuel cell systems, wherein said circulating pump and described fuel cell arrangement are an integral body.
6. as claim 3 or 4 described fuel cell systems, further comprise:
Purification channel (28), it is put into the outside of described fuel cell system with the loop direction of described fuel gas along described fuel gas from the upstream row of the set position of the described circulating pump of described fuel-gas circulation passage;
Break valve (240), it is arranged on the described purification channel;
Valve control part (430), it carries out the open-close control of described break valve; And
Oxidizing gas adjusting portion (440), it regulates the quantity delivered that is supplied to the described oxidizing gas of described fuel cell by described oxidizing gas supply unit,
Wherein when making described fuel cell carry out described generating, described warmup portion is opened the described quantity delivered of described break valve with the described fuel gas of the described fuel cell of increasing supply by making described valve control part, and make the described quantity delivered of the corresponding described oxidizing gas of described quantity delivered of described oxidizing gas adjusting portion increase and described fuel gas, increase the energy output of described fuel cell.
7. fuel cell system as claimed in claim 5 further comprises:
Purification channel (28), it is put into the outside of described fuel cell system with the loop direction of described fuel gas along described fuel gas from the upstream row of the set position of the described circulating pump of described fuel-gas circulation passage;
Break valve (240), it is arranged on the described purification channel;
Valve control part (430), it carries out the open-close control of described break valve; And
Oxidizing gas adjusting portion (440), it regulates the quantity delivered that is supplied to the described oxidizing gas of described fuel cell by described oxidizing gas supply unit,
Wherein when making described fuel cell carry out described generating, described warmup portion is opened the described quantity delivered of described break valve with the described fuel gas of the described fuel cell of increasing supply by making described valve control part, and make the described quantity delivered of the corresponding described oxidizing gas of described quantity delivered of described oxidizing gas adjusting portion increase and described fuel gas, increase the energy output of described fuel cell.
8. fuel cell system as claimed in claim 6 further comprises:
Oxidizing gas discharge-channel (36), it is discharged into described oxidizing gas the outside of described fuel cell system;
Diluter (60), it is connected to described purification channel and described oxidizing gas passage, and dilutes the hydrogen that is included in the described fuel gas by described fuel gas is mixed with described oxidizing gas; And
Mixture gas discharge channel (45), its discharging is from the mist of described diluter.
9. fuel cell system as claimed in claim 7 further comprises:
Oxidizing gas discharge-channel (36), it is discharged into described oxidizing gas the outside of described fuel cell system;
Diluter (60), it is connected to described purification channel and described oxidizing gas passage, and dilutes the hydrogen that is included in the described fuel gas by described fuel gas is mixed with described oxidizing gas; And
Mixture gas discharge channel (45), its discharging is from the mist of described diluter.
10. as each described fuel cell system in the claim 1 to 4, wherein said temperature detecting part is estimated the described temperature of described circulating pump from atmospheric temperature.
11. the method for operation of a fuel cell system, described fuel cell system comprises: fuel cell (10); Fuel gas supply portion (20); Will be from the fuel gas supply of described fuel gas supply portion fuel gas supply passage (24) to described fuel cell; Fuel-gas circulation passage (27), it is connected to described fuel cell and described fuel gas supply passage, and will be used to reuse from the described fuel gas circulates of described fuel cell exhaust to described fuel gas supply passage; And be arranged on the described fuel-gas circulation passage with the circulating pump (50) of the described fuel gas that circulates, described method of operation comprises:
When described fuel cell start-up, detect the temperature of the described circulating pump (50) of described fuel cell system, perhaps from the temperature of the described circulating pump (50) of the described fuel cell system of temperature estimation of atmospheric temperature or the described fuel cell in the described fuel cell system;
If the described temperature of the described circulating pump of the described described fuel cell system that detects or estimate is lower than the fusing point of water, then described circulating pump is heated;
Drive described circulating pump; And
If the described temperature of the described circulating pump of described fuel cell system is greater than or equal to the rotating speed of the fusing point of described water and described circulating pump less than desired speed, then is judged to be described circulating pump and damages.
CN2007800061291A 2006-03-22 2007-03-16 Fuel cell system and operation method for fuel cell system Active CN101390237B (en)

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US8541120B2 (en) 2013-09-24
WO2007107836A1 (en) 2007-09-27

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